[tista]

I'm new here and not able to search the forum.  I've found some instructions on how to adjust the bias, but I don't want to do it until I'm sure of the process.  To that end I made a visual diagram of the interior with the relevant spots marked for clarity.  If someone could used this diagram as a reference with instructions that would be incredible.  Maybe this will be useful for others as well.  Thanks in advance for any help.

[klaus@odyssey]

OK,  a correction here:

1. right offset poti
2. left offset poti
3. right side bias poti
4. left side bias poti
5. yes,  negative
6. & 7.  GROUND  !!!!  needed to bias the offset...either with negative or positive speaker outputs 5 & 8....NEVER NEVER EVER  use the positive and negative outputs 5 & 8 together to bias the offset !!!!!!!!!!!!!!!!!!!
8.  yes,  positive

[tista]

Thanks Klaus - I'll update the photo and add the instructions as I now understand fully what to do.  I think.  I'll run it by you first.

[tista]

I've revised the diagram based on all the posts about biasing, and Klaus' feedback.  Please check my work.  I believe I got it right.

[tista]

OK - I did it and it all worked fine.  Then my positive probe slipped out of TP3 and made contact with the metal rail to which the output transistors are affixed while I had the negative probe on the ground (unoccupied pad 7).  And a spark popped.  Shit.

Now the left side of the board shows no ability to adjust the left middle trim pot - it has no effect.  The offset still showed as functional and normal.  Neither fuse not the left or the main fuse popped.

What have I done.  I'm so pissed right now.

Any insight into my misfortune would be great.

Thanks

[klaus@odyssey]

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Well,  on that side of the amp,  put the meter on continuance (the beeping thing)  and measure the transistors legs...if you get a tone when testing any 2 legs,  then the outputs are blown,  and the puppies gotta come home for a while...problem is,  and I apologize to everybody here,  I am SLAMMED  !!!!!!  Then again,  once they're here I can bring them into 2025